BioSono provides a cyberspace (www.biosono.com) where researchers, engineers, and students can find useful reference and educational materials, conduct acoustic simulation, post questions on design and development, and get answers. The online KLM based transducer acoustic stack simulation, which is currently free, can help you choose piezoelectric, matching and backing material, and a tuning electrical network. The output from the model includes electrical transmit impedance, acoustic receive impedance, and the impulse or pulse-echo response. The ultrasound beam profile simulation provides the calculated transmitted ultrasound pressure field under certain excitation for a given transducer aperture in a number of different geometrical configurations, including circular elements (flat and concave piston), rectangular elements, linear arrays, convex arrays, and 2D arrays. The simulation is based on Field II, which is a free program that utilizes the spatial impulse response method, and has been validated by many researchers for accuracy. In addition to the web based acoustic simulation, we also provide pulse-echo system, transducers, and customized design and develop services.
Transducer KLM Model Simulation
Beam Profile Simulation
SonoLab Echo I
Time Gain Control
How it works:
A transceiver consists of a transmit and a protection circuit. Diode D1 & D2 have two functions. In addition to shut down the transmit pulse quickly when it drops to very low voltage, it also provides an open circuit to the transmitter for small echo signal from transducer. The protection circuit includes D3-D6 and R2-R3. When there is no input, D3-D6 are all open. The voltage at D3-D5 joint is the same as that at D4-D6.
When there is a small positive voltage signal comes in and causes input voltage at right side of C2 to increase but less than +4.3v, the voltage at R3 will increase accordingly and thus the output voltage at left side of C3. The output voltage only increases when D4 and D6 are open. It will stop at 4.3v no matter how high is the input.
When there is a small negative voltage signal comes in causing input voltage at right side of C2 to decrease but still higher than 0.7v, the voltage at R3 will drop accordingly and thus the output at right side of C3. The same as above mentioned, the output will stop at 0.7v no matter how low the input voltage goes.
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